==================================================================
BUG: KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch

read-write to 0xffff888100130b50 of 8 bytes by task 7299 on cpu 1:
 percpu_counter_add_batch+0xc9/0x140 lib/percpu_counter.c:96
 percpu_counter_add include/linux/percpu_counter.h:58 [inline]
 shmem_inode_acct_block mm/shmem.c:214 [inline]
 shmem_alloc_and_acct_folio mm/shmem.c:1597 [inline]
 shmem_get_folio_gfp+0x759/0x1200 mm/shmem.c:1948
 shmem_get_folio mm/shmem.c:2079 [inline]
 shmem_write_begin+0xa6/0x1d0 mm/shmem.c:2573
 generic_perform_write+0x1cf/0x410 mm/filemap.c:3923
 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4018
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4044
 call_write_iter include/linux/fs.h:1871 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888100130b50 of 8 bytes by task 7283 on cpu 0:
 percpu_counter_read include/linux/percpu_counter.h:90 [inline]
 __percpu_counter_compare+0x2b/0x1d0 lib/percpu_counter.c:238
 percpu_counter_compare include/linux/percpu_counter.h:53 [inline]
 shmem_inode_acct_block mm/shmem.c:211 [inline]
 shmem_alloc_and_acct_folio mm/shmem.c:1597 [inline]
 shmem_get_folio_gfp+0x722/0x1200 mm/shmem.c:1948
 shmem_get_folio mm/shmem.c:2079 [inline]
 shmem_write_begin+0xa6/0x1d0 mm/shmem.c:2573
 generic_perform_write+0x1cf/0x410 mm/filemap.c:3923
 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4018
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4044
 call_write_iter include/linux/fs.h:1871 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000037eb -> 0x000000000000380b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7283 Comm: syz-executor.4 Not tainted 6.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
==================================================================